合并同类项2(a-b)²-7(a-b)³+3(b-a)²-(b-a)³
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合并同类项2(a-b)²-7(a-b)³+3(b-a)²-(b-a)³
合并同类项2(a-b)²-7(a-b)³+3(b-a)²-(b-a)³
合并同类项2(a-b)²-7(a-b)³+3(b-a)²-(b-a)³
2(a-b)²-7(a-b)³+3(b-a)²-(b-a)³
=2(a-b)²-7(a-b)³+3(a-b)²+(a-b)³
=2(a-b)²+3(a-b)²-7(a-b)³+(a-b)³
=5(a-b)²-6(a-b)³
=5(a-b)²-6(a-b)³